John kelly



JOHN KELLY, OF VS7-EST MILTON,

OHIO, ASSIGNOR TO HIMSELF AND T. COATE, OF SAME PLACE.

PICKING MILLSTONES.

Specification of Letters Patent No. 29,748, dated August 21, 1860.

To all whom it may concern:

Be it known that I, J oHN KELLY, of `West Milton, in the county of Miami and State of Ohio, have invented a new and Improved Machine for Picking Millstones; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure l is a transverse vertical section of my invention taken in the line m, fc, Fig. 3. Fig. 2 a front elevation of the same. Fig. 3 a plan or top view of the same.

Similar letters of reference indicate corresponding parts in the several figures.

This invention relates to a machine for forming the small grooves between the large furrows of a mill stone, an operation which is generally termed cracking and which gives a tooth or grinding capacity to the stone. The object of the within described invention is to perform the above mentioned work far more expeditiously than it can be done by hand, and in a more perfect manner.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A, represents a bed piece at each end of which a way or guide c, is secured. B, is a frame which is fitted on said guides a, a, and is permitted to be moved back and forth thereon by a screw C, which passes through a nut I), in frame B, the screw C, having its bearing c, attached to the bed piece A. See Fig. l.

On the upper part of the frame B, there is placed between suitable longitudinal guides d, (l, a carriage D.' This carriage is allowed to move freely between the guides CZ, and is operated and moved to the right and left on the frame B, by means of a double screw E, which is placed longitudinally in the frame B, and has a fork F, fitted in it, said fork being at the lower end of an arbor c, which passes up through the carriage D, and is surmounted by a hand wheel f. The wheel f, has two notches g, g, made in its periphery at a suitable distance apart and into either of these notches a spring 7i., catches, said spring being attached to carriage D, as shown clearly in Fig. 2. The spring L, prevents the arbor c, from turning casually and consequently keeps the fork F, in its proper' spiral groove or channel formed by the threads of the screw E, for it will be under'- stood that the screw E, is composed of two threads z', a right and left hand one, crossing each other as shown clearly in Fig. 3 hence the term-double screw.

By turning the screw E, it will be seen that the carriage D, will be moved along between its guides CZ, d, in consequence of the fork F, fitting in the grooves between the threads of the screws. The fork F, will change from one groove to the other as it reaches their ends, the spring 7L., moving automatically out of one notch g, to the other g, or vice versa. The movement of the carriage D, however may be reversed at any time by turning the arbor e, manually so that the fork F, may be turned from one groove to the other. The spring h, as previously stated prevents the arbor c, from turning casually and consequently the fork F, will not` be accidentally moved from one groove to the other.

In the carriage D, a series of arms G, arc fitted on a common shaft H, the arms being allowed to work freely on said shaft. To the front ends of the arms G, there are attached right-angular bars I. These bars I, are secured to the arms G, by screw bolts z'x, which pass through the arms G, and through oblong slots in the upper parts of the bars I, see Fig. l. This mode of attachment admits of a longitudinal adjustment of the bars I, on the arms G.

To the lower parts of the bars I, picks J, are attached by screw bolts 7c, which pass through plates Z, at the front parts of the bars and through oblong slots m, in said bars, the plates Z, serving as clamps to secure the picks to the bars as will be fully understood by referring to Fig. l. The bars I, are provided with flanches n, at their edges both at their upper and lower parts and the arms G, are fitted between these flanches at the upper parts of the bars, the plates Z, and picks J, being between the hanches at the lower parts. By having the bolts 7c, pass through oblong slots m, in the bars I, the picks are rendered capable of being adjusted vertically as will be readily seen by referring to Fig. l.

To the upper surface of each arm G, there is attached a spring K. The back ends of these springs have pins n', attached to them,

said pins passing through the back ends of the arms Gr, and resting on screws o, as Shown in Fig. l.

On the upper part of the carriage D, there are placed a series of bars L, a bar L, being over each arm Gr. These bars L, are placed on a common shaft M, and through the front end of each bar L, a thumb screw 77, passes, and these screws rest or bear on a bar q, attached to the upper surface of the carriage D. The front parts of the bars L, have curved uprights 1, attached the use of which will be presently shown. The back parts of the bars L, are curved slightly downward toward the springs K, as shown in Fig. l.

On the upper part of the frame B, there is placed a shaft N, which is connected by gears s, with the screw E. On the shaft N, there is fitted by a feather and groove a cylinder, O, the periphery of which has a tappet P, attached. The cylinder O, is fitted between uprights t, t, one being at each side of the carriage D.

The bed piece A, is litted on the stone to be operated upon and in proper position, and the shaft N, is turned by the operator, motion being communicated to the screw E, by the gears, s. The screw E, as previously stated gives a lateral movement to the carriage D, in consequence of the fork F, fitting in one of the spiral grooves of the shaft E, and as the carriage is thus moved the arms G, are actuated by the tappet cylinder O, which moves with the carriage and the picks are brought down upon the stone by their own gravity in connection with the gravity of the arms G, the tappets P, being so dispersed on the periphery of the cylinder as to actuate the arms Gr, consecutively. The force of the blows of the picks are graduated by adjusting the-bars L, by means of the screws p, so that the back parts of the bars L, will be in vcontact with and bear more or less on the springs K, the latter serving to counteract to a certain extent the ,gravity of the arms G, and thereby graduate 4an essential feature for in parts of the stone where soft places occur the blow of the picks must be quite light compared with the blows at the hard parts of the stone. The movement of the carriage D, is reversed at any time by turning the arbor e, as previously referred to.

To the front part of the frame B, there is attached a plate Q, as shown in Fig. 2. This plate serves to keep up the picks before they are brought over the edge of the tone, the innermost pick of course operating rst.

Before the commencement of the operation the picks J, are all adjusted in line with each other. This adjustment of the picks is permitted in consequence of the manner of attaching the bars I, to the arms Gr, and the manner of securing the picks J, to the bars I.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is* The combination of the Y right and left hand screw E, with the reciprocating carriage D, carrying the pick arms Gr, bars L, springs K, and tappet cylinder O, operating in the manner and for the purpose described.

JOHN KELLY.

Witnesses:

J AMES EDEMAN, JOHN PORTER. 

